Means for working rubber



Oct. 5, 1948. s, BQLLING 2,450,575

MEANS FOR WORKING RUBBER Filed July 13, 1945 2 Sheets-Sheet 1 y L [f/ v ,f2 j 2z :ty /a 07 32 n kfz /7 2- El// Z8" 175%/ f8 /z` /Yz f7 J 325 /gg 29* 3 2 e E 4- 'Si /3 we 3o` '4 y /20 `9` za 9 /4- l v ZJ /z l 'g l 22 l' 2z y #fr0/mans'.

Oct. 5, 1948.

S. BOLLNG MEANS Foa WORKING RUBBER Filed July 13, 1945 2 Sheets-sheet 2 TTOF/VEY'S.

Patented Oct. 5, 1948 UNI TED S T ATgES i PATEN T OFFICE MEANS FOR WORKING RUBBER Stewart'Bolling, Cleveland, Ohio Application July 13V, 1945, vSerial No. A6045746 2v Claims.

This invention relates .toazrneans `for working rubber, and moreespecially to machines ofthe :type known as mixers, extruders, etc. :In :ma-

chines for mixing synthetic or natural rubber,

:.plastics, 4rnastics and vlike substances, rit has lbeen foundnecessary `to heat or chill the chamber wherein the :material `is being .worked and it is an object of the presentinvention to-provide new .and improved means whereby either Va heating ragent or a chilling agent can be utilizedffor con- ;trolling ,the temperature of Vthe material under treatment.

As isvwellrknown to those skilled in the art, it

lis necessary, `under some conditions, to vheat the vbatch of material during the beginning of the vmixing or =kneading operation and thereafter to chill the material so as tc prevent setting, or partial vulcanization or thermo settingbefore the ingredients are thoroughly dispersed.

The present invention has for its Iobject the provision of a new and eicient means whereby the heating or chilling medium can be ,properly applied for the purpose of obtaining the results desired, this medium flowing in a continuous stream back and forth from top to bottom within `the .side wall of themixer.

Itis a lfurther object to provide a novel Lform of sidewall formixers of this type the interior portionsrof which are readily accessible for cleaningpurposes and are so constructed as to permit easy construction with anovel arrangement of ribs whereby a tortuous iiow of the mediumis `made possible and it becomes unnecessaryto use sprays or the like as heretofore required in order to (get-the best results.

With the foregoing and other objects in view which will appear as .the description proceeds,

.the .inventionconsists of certain details ofconstruction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes .may be made in the :construction and arrangement of parts without departingfrom the spirit offthe invention as claimed.

In Vthe accompanying drawings, the preferred `form of the invention has been shown.

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cover or vbaille Yplate which cooperates withsaid .structure has beenfdevised wherebyiboth the heat and cold canbeeutilized in any desired succession -and'forv any desired 'periods of time. .Further-more,

the chilling means ,heretofore Yemployed andutilzingsprays have disadvantages Vdue to the fact thatit has been ',diicult to preventcorrosion, scaling or ilaking resulting fromthe mediumgused for chilling purposes, Vnor -has it been ,an -easy 4matter to obtain access to the parts-for the purpose Aof cleaningfthem. g

In the presentfinstance, the desired results Aare obtained by providingfon each of fthe walls 5v=a box-like extension -B lformed of upper and lower `wa 1s land side fwalls adapted to lbe engaged by cov-er plate @which canbe v.held in place by bolts I0 or the like and which can be tted snugly between the side walls v8` so as to bear upon iianges II forming seats.

The space within the box-like extension B has spaced parallel vlongitudinal .ribs I2, .I3 Aand I4 cooperatingwith `the Vupper and lower .walls .1 and witheachfother-to provide parallel channels l5,

vArranged on the-outer surface v.of Ywall .5 are arcuate ns .I9 .extending -from Vthe top .to I.the

bottom of -each channel. -Any desired lnumber of these ns can be applied,but it is desirable to have them widel-yfspa-ced, -as shown in Figure 3.

Aport 20'is providedinonevend portion of the `wall 'I `and .anotherport .2| is provided 'in-one `endportion ko1 the other wall .'I. One vof these ports constitutes an inletfor the temperature controlling medium, while the other port constitutes an outlet, there .being any suitable arrangement of pipes 22 leading to and from lthe ports.

f A passage 23 is provided in that end of rib I2 remote from the adjacent port 20. Another pas' sage 24 is provided in rib I3 at that end thereof 't remote from passage 23. Another passage 25 is provided in rib I4 at a point substantially in line with passage 23 and remote from the port 2l.

As shown particularly in Figure 1, the ribs I2, I3 and I4 are of different sizes due to the fact that they extend from an a-rcuate wall 5 and that their outer ends are flush with the Walls 7 and the iianges or seats II. All of these ribs, as well as the walls 'I provide seats for the cover plate '9 which has an arcuate inner surface 2B concentric with but spaced from the outer surface of the wall 5. Slots 2l are provided in the cover plate and are proportioned and located so that the several ribs, I2, I3 and I4 will i'lt snugly therein. These slots divide the inner portion of the cover plate into lling blocks A28, 29, 30 and 3l and formed on the inner faces of these filling blocks are ns 32 which project between the fins I9 as shown particularly in Figure 2 and extend transversely of the channels I5, I6, I'I and I8.

It will be apparent from the foregoing explanation that a temperature controlling medium used either for chilling or heating purposes can be directed through one of the ports 20 or 2l into one end of one of the channels. Assuming that the medium enters at port 20, it can reach the port 2l solely by following a tortuous path leading along the channel I5 from port 2 to passage 23, thence along channel I6 to passage 24, thence along channel I'I to passage 25 and lnally along channel I8 to port 2l. The successive courses of the tortuous path are located in an arc concentric with the inner arcuate surface of the wall carrying them. During this movement along a ytortuous path the medium must iiow past the alternately arranged fins I9 and 32 with the result that the medium is agitated and caused to form eddies or open areas which, during a cooling operation, cause vapor tension resulting in better cooling. The alternately arranged bales 0r fins are useful for the transfer of thermal units during a heating operation.

Obviously, the apparatus can quickly be changed from a heating to a cooling machine and vice versa simply by changing the type of temperature controlling medium admitted thereto. As there are no nozzles or other devices likely to become clogged and rendered inelcient, the efficiency of the present structure can be easily maintained. However, should the passageays become partially choked from any cause, 5 is possible readily to clear them simply by removing the cover plates and the filling blocks integral therewith so that all surfaces of the passages are thus exposed where they can be easily cleaned.`

In a machine such as described it is easy to meet those conditions in the mixing of synthetic rubber and plastics requiring the heating of the material being worked, during the rst portion of the mixing operation followed by a chilling action so as to prevent setting or partial vulcanization or thermo setting before the ingradients are thoroughly dispersed.

It is to be understood, of course, that both sides of the machine are of duplicate construction so that the temperature controlling mediums can thus be circulated over the outer surfaces of the walls of both cylinders 5.

As the two cylinders cooperate to form a Working chamber having the outlet gate or door 4, it will be obvious that interchange of thermal units through the Walls 5 of the working chamber and cylinders will result in rapid change of temperature of the material under treatment.

What is claimed is: 1. A machine of the class described including a working cylinder having an arcuate wall, a box like extension on and extending outwardly from said wall, the extension including parallel upper and lower Walls and parallel side Walls, said upper and lower walls and side walls having flush outer edges, spaced longitudinal ribs, defining longitudinal channels, on the cylinder wall disposed parallel to, and having their outer edges ush with the outer edges of, the upper and lower walls of the extension, there being a passage at one end of each rib providing communication between adjacent channels, each passage being oppositely disposed relative to the next adjacent passage, spaced arcuate fins on the cylinder wall extending transversely across each channel, a cover plate removably connected to the outer edges of the upper and lower walls and side walls of the extension, said plate having an arcuate inner surface spaced from, and concentric with, the cylinder wall, the plate having longitudinal slots wherein the longitudinal ribs are received, and transverse arcuate ns on the inner surface of the plate disposed alternately to the ns of the cylinder wall.

2. A machine of the class described including a working cylinder having an arcuate wall, an extension on and extending outwardly from said wall, said extension including parallel upper and lower walls and parallel side walls, spaced longitudinal ribs, dening longitudinal channels, on the cylinder Wall disposed parallel to the upper and lower` walls of the extension, there being a passage at one end of each rib providing comn munication between adjacent channels, each passage being oppositely disposed relative to the next adjacent passage, spaced transverse arcuate iins on the cylinder wall extending across each channel, a cover plateremovably connected to the upperrand lower walls and side walls of the extension, said plate having an arcuate inner surface spaced from, and concentric with, the cylinder wall, the plate having longitudinal slots wherein the longitudinal ribs are received, and transverse arcuate ns on the inner surface of the plate disposed alternately to the fins of the cylinder wall.

STEWART ROLLING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 202,886 Strunz Apr. 23, 1878 1,881,171 Cooley Oct. 4; 1932 1,965,422 Lodge July 3, 1934 2,170,396 Banbury Aug. 22, 1939 2,265,552 Sticelber Dec. 9, 1941 

